Abstract: Disclosed is a biological information processing apparatus and a signal processing method, wherein a biological signal comprising a first signal component having periodicity is generated, and a given frequency distribution is generated based on a second-order difference signal obtained by subjecting the biological signal to a second-order differencing operation, whereafter, with respect to the generated frequency distribution, an effective greatest frequency zone which is a zone having a greatest frequency of an interval-time is determined based on a given criterion, and a period of the first signal component is calculated based on an average time interval in the effective greatest frequency zone.

Abstract: In a pulse oximeter of the invention, an arterial blood oxygen saturation at least at a walking end point of time is stored in a storage, in response to a detection result from a detector for detecting whether a subject is walking. With use of the pulse oximeter, a measurement result on arterial blood oxygen saturation in association with walking can be automatically obtained, without the accompaniment of a laboratory technician or a like support.

Abstract: A color display characteristic measurement apparatus is provided with a first image pickup device for picking up an image of a first color component, a second image pickup device for picking up an image of a second color component, a measurement image generator for causing a color display apparatus to display a measurement image thereon, the measurement image being displayed in a single color to which both the first image pickup device and the second image pickup device are sensible, and a calculator for calculating, based on a first picked-up image of the first image pickup device and a second picked-up image of the second image pickup device, calibration data for calibrating a relative displacement between the first and second image pickup devices.

Abstract: A calibrating system of a display characteristic measurement apparatus includes a calibration pattern display unit for displaying a calibration pattern at substantially the same luminescence characteristic as that of a display apparatus to be measured, an image pickup unit provided in a display characteristic measurement apparatus for picking up a calibration pattern displayed on the display apparatus to generate image data, and a calculator for calculating, based on the generated image data, calibration data for the display characteristic measurement apparatus.

Abstract: A measuring device for measuring a glow center of a display device is provided with: an image pickup device which includes a sensing surface defined by a plurality of photoelectric conversion elements arranged in a two-dimensional manner at a specified pitch and picks up a light image to produce image data; an optical system which transmits a light image displayed on a display device to the sensing surface of the image pickup device; an optical system controller which controls the optical system to transmit the light image to the sensing surface in such a manner that the maximum spatial frequency of the light image at the sensing surface of the image pickup device is smaller than the reciprocal of the pitch of the photoelectric conversion element arrangement; and a calculator which calculates a glow center of the light image on the display device based on image data produced by the image pickup device.

Abstract: The object of this invention is to provide an extremely simple device to extract information to distinguish between obstructive apnea and central apnea and which performs this operation automatically based on the extracted information.The device is equipped with analog signal processor 2 for generating pulse wave signals based on light received from a light emitting means and passing through or reflecting off living tissue; pulse wave base line analog signal processor 9 for extracting change components of a base line of the generated pulse wave signal; and master microcomputer 6 for distinguishing between obstructive apnea and central apnea on the basis of the extracted pulse wave base line change components.

Abstract: An infrared image pick-up apparatus includes: a body having a condenser lens for condensing an infrared ray emitted from an object, a sensor for detecting intensity of the condensed ray and generating an electric signal corresponding to the intensity, a signal processing circuit for processing the signal from the sensor, and a display device for displaying a two-dimensional infrared image in accordance with a signal from the circuit; and a grip provided separately from the body and attached thereto. The grip has an operating member for adjusting an infrared image on the display device.

Abstract: An improved oximeter device for the calculation of oxygen saturation in arterial blood is provided. A pair of LED's are positioned to transmit red and infrared light through tissue containing the blood. A photo electric converter is provided to receive the transmitted light and convert it into a electrical signals. The probe can store data directed to various characteristics of the LED's, such as the primary wavelength and a secondary wavelength of the LED and an indication of the amount of crosstalk that can occur in the signals. The correction of any errors resulting from crosstalk plus the calculation of oxygen saturation depending on the various characteristics of the LED's can be effectuated.

Abstract: A medical apparatus for detecting apnea, in particular, in infants and children. The apparatus measures oxygen saturation in the blood and relates the measurement to a normal condition. The relationship is employed to indicate apnea.

Abstract: An oximeter for measuring oxygen saturation in arterial blood includes a light source for projecting light to a body member to be measured, a light responsive circuit for receiving the light which has transmitted through said body member and for generating at least first, second and third signals at three different wavelengths, and a calculator for calculating at least first SaO.sub.2 data using first and second signals and second SaO.sub.2 data using first and third signals. It is detected whether or not a difference between the first and second SaO.sub.2 data is within a predetermined level. When the difference is within the predetermined level, it is assumed that the first and/or second SaO.sub.2 data are valid, but if not, they are assumed as invalid.

Abstract: A noninvasive device for photoelectrically measuring a property of arterial blood is provided. Light that contacts living tissue with arterial blood is converted into a pair of electrical signals. The electrical signals are processed to provide information of the amplitude of the measured signals and are further processed to produce a final output signal that is substantially a square function of a ratio between the electrical signals representative of the amplitudes.

Abstract: A noninvasive device for photoelectrically measuring a property of arterial blood is provided. Light that contacts living tissue with arterial blood is converted into a pair of electrical signals. The electrical signals are processed to provide information of the amplitude of the measured signals and are further processed to produce a final output signal that is substantially a square function of a ratio between the electrical signals representative of the amplitudes.

Abstract: A digital oximeter for noninvasively measuring oxygen saturation of the arterial blood is provided. Photoelectric transducers measure the light intensity after passing through living tissue to produce at least a pair of output signals of different wavelengths of light. A sample hold circuit is provided for correspondingly storing each of the respective output signals. A microprocessor controlled pulse activates a subsequent subtraction step between a second measurement taken for each of the respective wavelengths to correspondingly produce at least a first and second subtraction output. The circuit can then process at least the first and second stored light outputs and the first and second subtraction outputs to indicate the oxygen saturation.